It's Complicated (2009)

After Ashley asks for a divorce, good-natured Carey runs to his friends, Julie and Paul, for support. He’s shocked to discover that the secret to their happiness is an open marriage, that is until Carey crosses the line and throws all of their relationships into chaos.

Ironworker Nick lives with his wife, Kitty, and three daughters. When he meets a significantly younger woman, Tula, he starts an affair with her, much to the chagrin of his wife, and his life is thrown into upheaval. Kitty kicks Nick out of the house, and he is forced to make some difficult decisions.

When Larry and Maria learn that their respective spouses are cheating on them, they try to turn the tables on them by pretending to have an affair. However, they soon find themselves falling in love.

Unfounded suspicions lead a married couple to begin divorce proceedings, whereupon they start undermining each other's attempts to find new romance.

A young man meets and instantly falls in love with an engaged woman.

After a high-profile firing, everything is at stake for 40-year-old Jenna: her career, her ticking biological clock, and her bank account. Her fashion career comeback hits a snag when she falls for a charming, much younger coworker — who happens to be her boss’s son. As sparks fly, Jenna must decide if she’ll risk it all on a secret romance with the one person who could destroy her comeback.

Lu, a conformist woman in her forties, learns that her 15-year partner has been having extramarital affairs. Starting from scratch, she gets involved in an unexpected relationship with a young womanizer.

With varying degrees of success, recently divorced friends Dave, Vic and Donny are trying to move on with their lives. Vic feels vilified by his ex-wife's parents, while Donny has a shaky bond with his teen daughter, Emma. Dave, meanwhile, has an enviable problem -- he has more dates than he can handle. As they confront their post-marital challenges, the men take solace in one another's plights.

A young woman escapes her wildly eccentric family in search for a life of normalcy.

Peter and Emma thought they were on the precipice of life’s biggest moments – marriage, kids, and houses in the suburbs – until their respective partners dumped them. Horrified to learn that the loves of their lives have already moved on, Peter and Emma hatch a hilarious plan to win back their exes with unexpected results.